Crankcase bottom part



June 1970 H. DEUTSCHMANN ET AL 3,515,110

CRANKCASE BOTTOM PART Fi1ed June 13, 1968 FIG. l

INVENTORS HERBERT DEUTSCHMANN JUERGEN WAHNSCHAFFE WOLFGANG RUDERT BYHERBERT MAUER ATTORNEYS United States Patent O 3,515110 CRANKCASE BOTTOMPART Herbert Deutschmann, Stuttgart-Bad Cannstatt, Jrgen Wahnschalfe,Stuttgart-Stammheim, Wolfgang Rudert, Grunbach, Kreis Waiblingen, andHerbert Maden, Stuttgart, Germany, assignors to Daimler-BenzAktiengesellschaft, Stuttga-Unterturkheim, Germany Filed June 13, 1968,Ser. N0. 736,813

Claims priority, application Germany, June 15, 1967,

36 Int. Cl. Flm 9/15; F16n 31/00,- F02f 7/00 U.S. c1. 12s19s ClaimsABSTRACT OF THE DISCLOSURE A crankcase bottom part for an internalcombustion engine, especially with dry-sump lubrication, in which apervious intermediate bottom is arranged between the sump and therotating engine parts permitting the assage of the lubricant. Thepervious intermediate bottom may be provided with deflection means onthe side facing the rotating parts of the engine formed bytongue-portions punched out of the pervious intermediate bottom. Thetongue-portions can be inclined so as to collect lubricant particlescentrifuged by the rotating parts of the engine. Liquid-tight coverparts may also be arranged within the area of the pervious intermediatebottom above an aperture in the line system operable to suck off thelubricant.

The present invention relates to a crankcase bottom part for an internalcombustion engine, especially with dry-sump lubrication.

The aim underlying the present invention essentially resides in reducingthe harmful splash work in the lubricant sump.

As solution t0 the underly'ing roblems, it is proposed according to thepresent invention that a liquid-perrneable or pervious intermediatebottom is arranged between the sump and the rotating engine parts.Several advantages are achieved by the present invention. The oil streamor oil flow within the sump toward the suction place is quieted and isnot disturbed by the rotating masses. The distance between the sump andthe rotating engine parts can therefore be kept smaller, notwithstandingthe arrangement of the intermediate bottorn whereby the crankcase can beconstructed more flat.

According to a further feature of the present invention, liquid-tightcover parts may be arranged within the area 0f the intermediate bottomabove an aperture of the line system operable to suck off the lubricant.It is prevented thereby that the quieted inflow of the lubricant intothe suction aperture is disturbed by the oil and/er oil swirls andeddies of the connecting-rod-weights or counterweights splashed throughthe intermediate bottom, and that no addition suction losses for the oilsuction Pumps arise.

According to another feature of the present invention, deflection partsfor the centrifuged lubricant may be provided on the side cf theintermediate bottom facing the rotating engine parts. The production ofan oil roller produced by the rotating parts is prevented thereby.

Accordingly, it is an object of the present invention to provide acrankcase bottom part for internal combustion engines, especially withdry-sump lubrication, which avoids by simple means the aforementionedshortcomings and drawbacks encountered in the prior art.

Another object of the present invention resides in a crankcase bottompart which precludes the harmful splash effect in the lubricant sump.

A further object of the present invention resides in an 3,5 15,1 10Patented June 2, 1970 ice internal combustion engine with a crankcasebottom part in which the oil flow in the sump toward the suction placeis quieted and also protected against disturbance due to turbulence andswirls caused by the rotating engine parts.

Still a further object of the present invention resides in a crankcasebottom part for internal combustion engines, especially with dry-sumplubrication, which can be constructed relatively flat in accordance withpresent-day vehicle requirernents.

Another object of the present inventiom resides in a crankcase bottompart for internal combustion engines with dry-sump lubrication in whichthe inflow cf the lubricant into the suction aperture is renderedrelatively calm, no additional unnecessary suction losses for the oilsuction pumps occur and an oil roller produced by the rotating parts isprecluded.

These and further objects, features and advantages of the presentinvention will become more obvious from the following description whentaken in connection with the accompanying drawing which shows, forpurposes of illustration only, one embodirnent of a crankcase inaccordance with the present invention and wherein:

FIG. 1 is a cross-sectional view through a crankcase bottom part inaccordance With the present invention; and

FIG. 2 is a schematic longitudinal cross section through a crankcasebottom part in accordance with the present invention illustratingcertain additional features in accordance with the present invention.

Referring now to the drawing and more particularly to FIG. 1, referencenumeral 10 generally designates in this figure a crankcase bottom partin which an intermediate bottom 12, made from sheet metal, is secured bymeans of bolts 13 at housing supports 14, 15 and 16 closely above thehousing bottom 11.

The radially outermost paths of the rotating engine parts relative tothe crankshaft axis 17 are designated in FIG. 1 by reference numerals18, 19, 20 and 21.

Deflection tongues 12a are punched out or formed out of the sheet metalbottom 12 which collect the oilair mixture particles swirled along inthe direction of arrow 22 and guide the same into the sump through theapertures 12b of the intermediate bottorn 12. The apertures 12b areproduced by stamping out or punching out of the tongues 12a.

In FIG. 2, the cranckcase bottom part is designated by reference numeral23 and the apertured intermediate bottom by reference numeral 24. At anend face of the bottom part 23, a suction channel 25 extendingtransversely to the crankshaft axis is provided which terminates by wayof a sieve 26 and of a suction connection 27 in the sump ofthecrankcase. A fluid-tight covering sheet metal plate 29 is securelyarranged and held stationary above the aperture 28 of the suctionconnection 27 on the side of the sump which eifects a quieting andcalming of the inflow at the aperture 28 also in the case when rotatingengine parts thrust or centrifuge oil or oil mixture particles into thesump above the aperture 28.

While we have shown and described only two embodiments in accordancewith the present inventio'n, it is understood that the same is notlimited thereto, but susceptible of numerous changes and modificationsas known to a person skilled in the art, and we therefore do not wish tobe limited to the details shown and described herein but intend to cover all such changes and modifications as are encompassed by the scope ofthe present invention.

We clairn:

l. A crankcase bottom part for an internal combustion engine, especiallywith dry sump lubrication, characterized in that a permeableintermediate bottom is arranged between the sump and the rotating engineparts, a line system having a suction aperture being provided for thelubricant, and fluid-tight cover means being arranged within the area ofthe intermediate bottom above the suction aperture of the line system,wherein the intermediate bottom is provided with deflection means 0n itsside facing the rotating parts of the engine for guiding centrifugedlubricant particles through the intermediate bottom.

2. A crankcase bottom part for an internal combustion engine, especiallywith dry sump lu*brication, characterized in that a permea bleintermediate bottom is arranged between the sump and the rotating engineparts, wherein the intermediate bottom is provided with deflection means011 its side facing the rotating parts of the engine for guidingcentrifuged lubricant particles through the intermediate bottom.

3. A crankcase bottom part according to claim 1, further comprisingmeans for detachably securing said intermediate bottom to the crankcasebottom part.

4. A crankcase bottom part according to claim 3, wherein said deflectionmeans are formed by tongueportions punched out of the intermediatebottom leaving apertures rendering said intermediate bottom pervious tothe lubricant.

5. A crankcase bottom part according to claim 4, wherein thetongue-portions of the deflection means are so inclined as to collectlubricant particles taken along and centrifuged by the rotating engineparts.

6. A crankcase bottom part according to claim 2, further comprisingmeans for detachably securing said intermediate bottom to the crankcasebottom part.

7. A crankcase bottom part according to claim 6, wherein said deflectionmeans are formed by tongue-por- 4 tions punched out of the intermedia tebottom leaving apertures rendering said intermediate bottom pervious tothe lubricant.

8. A crankcase bottom part according to claim 7, wherein thetongue-portions of the deflection means are so inclined as to collectlubricant particles taken along and centrifuged by the r0tating engineparts.

9. A crankcase bottom part according to claim 2, wherein said deflectionmeans are formed by tongueportions punched out of the intermediatebottom leaving apertures rendering said intermediate bottom pervious tothe lubricant.

10. A crankcase bottom part according to claim 2, Wherein the deflectionmeans are so inclined as to collect lubricant particles taken along andcentrifuged by the rotating engine arts.

References Cited UNITED STATES PATENTS 13815 16 6/ 1921 Strickland.

1676369 7/ 1928 Vincent.

1,878224 9/1932 Woolson.

1,916,522 7/1933 McCuen.

1,927,770 7/1933 Birkigt.

1,995,438 3/1935 Sheats.

2,374,822 5/1945 Le Clair.

2,408,923 10/1946 Frederick 188106 XR WENDELL E. BURNS, Primary ExaminerU.S. C1. X.R. 1846

